Lincoln AIR VANTAGE IM985 - Manual (Page 27)

For optimal performance, set the MODE switch to ARC
GOUGING. Set the OUTPUT CONTROL knob to adjust out-
put current to the desired level for the gouging electrode
being used according to the ratings in the following Table
B.4
The ARC CONTROL is not active in the ARC GOUGING
Mode. The ARC CONTROL is automatically set to maximum
when the ARC GOUGING mode is selected which provides
the best ARC GOUGING performance.
NOTE: With the VRD switch in the “ON” position there is no
output in the Arc Gouging Mode. For indicator light opera-
tion, see table B.1.
NOTE: If desired the CV mode can be used for Arc Gouging.
* Maximum current setting is limited to the AIR VANTAGE® 500
KUBOTA maximum of 575 Amps.
WIRE WELDING-CV
Connect a wire feeder to the AIR VANTAGE® 500 KUBOTA
according to the instructions in INSTALLATION INSTRUC-
TIONS Section.
The AIR VANTAGE® 500 KUBOTA in the CV-WIRE mode,
permits it to be used with a broad range of flux cored wire
(Innershield and Outershield) electrodes and solid wires for
MIG welding (gas metal arc welding). Welding can be finely
tuned using the ARC CONTROL. Turning the ARC CON-
TROL clockwise from –10 (soft) to +10 (crisp) changes the
arc from soft and washed-in to crisp and narrow. It acts as
an inductance/pinch control. The proper setting depends on
the procedure and operator preference. Start with the dial
set at 0.
NOTE: In the CV-Mode with VRD “On”, the OCV(Open
Circuit Voltage) is not reduced. For indicator light
operation, see table B.1.
ARC GOUGING
The AIR VANTAGE® 500 KUBOTA can be used for arc
gouging.
Carbon Diameter Current Range (DC, electrode
positive)
1/8"(3.2mm) 30-60 Amps
5/32"(4.0mm) 90-150 Amps
3/16"9(4.8mm) 200-250 Amps
1/4"(6.4mm) 300-400 Amps
3/8"(10.0mm) 450-575 Amps*
TAbLE b.4
b-9 OPERATION b-9
AIR VANTAGE® 500 KUbOTA
Table b.3 TYPICAL CURRENT RANGES (1) FOR TUNGSTEN ELECTRODES (2)
DCEN (-) DCEP (+) Approximate Argon Gas Flow Rate
l/min (c.f.m.)
Tungsten
Electrode
1%, 2% 1%, 2% TIG TORCH
Diameter Thoriated Thoriated Aluminium Stainless Steel Nozzle
mm (in) Tungsten Tungsten Size (4), (5)
.25 (0.010) 2-15 (3) 2-4 (3-8) 2-4 (3-8) #4, #5, #6
.50 (0.020) 5-20 (3) 3-5 (5-10) 3-5 (5-10)
1.0 (0.040) 15-80 (3) 3-5 (5-10) 3-5 (5-10)
1.6 (1/16) 70-150 10-20 3-5 (5-10) 4-6 (9-13) #5, #6
2.4 (3/32) 150-250 15-30 6-8 (13-17) 5-7 (11-15) #6, #7, #8
3.2 (1/8) 250-400 25-40 7-11 (15-23) 5-7 (11-15)
4.0 (5/32) 400-500 40-55 10-12 (21-25) 6-8 (13-17) #8, #10
4.8 (3/16) 500-750 55-80 11-13 (23-27) 8-10 (18-22)
6.4 (1/4) 750-1000 80-125 13-15 (28-32) 11-13 (23-27)
(1) When used with argon gas. The current ranges shown must be reduced when using argon/helium or pure helium shielding gases.
(2) Tungsten electrodes are classified as follows by the American Welding Society (AWS):
Pure EWP
1% Thoriated EWTh-1
2% Thoriated EWTh-2
Though not yet recognized by the AWS, Ceriated Tungsten is now widely accepted as a substitute for 2% Thoriated Tungsten in AC and DC applica-
tions.
(3) DCEP is not commonly used in these sizes.
(4) TIG torch nozzle “sizes” are in multiples of 1/16ths of an inch:
# 4 = 1/4 in. 6 mm
# 5 = 5/16 in. 8 mm
# 6 = 3/8 in. 10 mm
# 7 = 7/16 in. 11 mm
# 8 = 1/2 in. 12.5 mm
#10 = 5/8 in. 16 mm
(5) TIG torch nozzles are typically made from alumina ceramic. Special applications may require lava nozzles, which are less prone to breakage, but can-
not withstand high temperatures and high duty cycles.